Drill.



J. T. GURNOW.

DRILL.

APPLICATION FILED MAY 24, 1913.

1,095,085. Patented Apr. 28, 1914.

2 SHEETS*SHEET l.

d Y A am ATTORNEYS coLuMmA PLANOGRAl-n C0..wAsmNaToN. D. c.

J. T. GURNOW.

DRILL.

APPLICATION FILED MAY 24, 1913. I 1,095,085, Patented Apr.28, 1914.

2 SHEETS-SHEET 2.

1'? 4Q; l 4 il. 40d@ .so la xd) .55 4e u"7 e@ .31 29 4 1.9 Q E Z6 n.

af 44 2 if g f 'J l 24 A TTHNEYS JOI-IN THOMAS CURNOW, OF PALATKA, MICHIGAN.

DRILL.

`Specification of Letters Patent.

Patented Apr. 28, 1914.

Application filed May 24, 1913. Serial No.V 769,587.

To alt @07mm t may conce/m Be it known that l, JOHN T. CURNow, a citizen of the United States, and a resident of Falatka, in the county of Iron and State of Michigan, have invented a new and Improved Drill, of which the following is a full, clear, and exact description.

Among the principal objects which the present invention has in view are: to provide mea-ns for clearing a drill hole of debris during the operation of drilling; to provide means for introducing a water-jet in a drill hole for washing the saine and cooling the drill point; to provide means for utilizing the power applied to the drill for water-jetting the drill hole; and to pro vide means for controlling the supply of water to the drill hole.

One embodiment of the present invention is shown in the accompanying drawings, in which- Figure 1 is a pictorial view showing a drill constructed and arranged in accordance with the present invention in operating position; Fig. 2 is a detail view on an enlarged scale, showing a fragment of the drill and in section the water-pumping mechanism thereof; Fig. 3 is a detail view on an enlarged scale, showing in longitudinal section the cutting end of a drillbit, the section being taken on the line 3 3 in Fig. 2; Fig. 4 is an end view oi' the bit shown in Figs. 2 and 3.

As seen inthe accompanying drawings, the usual die rods for holding the heads on the cylinder 9 of the pneumatic engine are substituted by rods 10, which are elongated to pass through bolting flanges 11 and 12 of a pump casing 13, which is added by the present invention to the cylinder 9 and in tandem relation thereto.

The bolts 10 are extended through bolting flanges 14 and 15 of the brace rod and the drill rod, respectively. The structure is drawn tight by the rods when the nuts 16 are set up in the manner common to the usual practice.

The pneumatic engine may be of any approved reciprocating type. When altered to conform with the present invention, the piston rod 17 is bored centrally to form a passage 18 for the water which is delivered by the piston 19 from the pump cylinder 20. Suitable chucks are provided, whereby the piston rod 17 is operatively connected with the drill-bit 21, care being exercised that the passage 18 inthe piston rod is in open coinmunication with a passage 22 in the bit 21.

Air under pressure is furnished by means of a supply pipe 23 to the cylinder 9, the supply being controlled by a valve 24 and a manipulating lever 25 therefor. The air is prevented from passing from the cylinder 9 to the cylinder 20 by means of packing 26. The packing 26 is disposed substantially as shown in Fig. 2 of the drawings, in pocket recesses formed in the heads ot' the two cylinders, said cylinders being bored to provide integrally-formed and closed ends.

The packing 26 prevents the admission o1 air to the cylinder 20 to interfere with the pump mechanism or water supplied to the cylinder 2O from the water-supply pipe 27. The water-supply pipe 27 is connected with an auxiliary chamber 28, wherein are formed cross partitions bored to provide seats for ball valves 29 and 30.

Each of the valves 29 and 30 and 32, is normally seated by spiral springs 31. The spiral spring 31, pressing upon the ball valve :32, is braced or held in operative position by means of a spider, past which the water flows from the inlet passage 33 to the upper inlet passage 34 adapted to deliver the water to the cylinder 20 at the far side of the piston 19. A like purpose is served by the inlet passage 35 which delivers water from the auxiliary chamber of the cylinder 2() on the near side of said piston.

It is the purpose of the invention to deliver, in so far as possible, with a reciprocating mechanism, a steady stream or jet of water through the passage 22 to the point or head of the drill-bit 21. To this end, the piston 19 is provided with two chambers 36 and 37, the former of which is intermittently in open communication with the far end of the'cylinder 20 through a passage 38, and the latter with the near end of said cylinder through a passage 39. These passages are normally closed by ball valves 40 and 41, respectively. The ball valves are normally held to their seats to close said passages 38 and 39, by means of springs 42. The chambers 36 and 37 are both in open communication with the passage 18 in the piston rod 17 lateral bores being extended from the passage 18 to tap the chambers 36 and 37, as best seen in Fig. 2 of the drawings.

The piston 19 is suitably bored to receive the end of the rod 17 and to provide seats for the shoulders formed on said rodto support said piston. The piston is held on said rod 17 by means of a nut 43, the threads whereof register with and engage the threads on the reduced eXtreme end of the rod 17.

The supply of water admitted to the auX- iliary chamber 28, and hence to the cylinder 20, is controlled by a valve 44. The supply of water may be furnished in any suitable manner. As shown in Fig. 1 of the drawings, the water is supplied from a receptacle 45. The amount of water is not necessarily large, the object being rather to maintain a steady and constant flow capable of washing the dust or borings from the bottom of the drill hole. Having a drill thus constructed and arranged, the method of steadying, adjusting and operating said drill is that at present in vogue. When the drilling has proceeded and a hole is partly formed, the valve 44 is opened to supply a full or di minished quantity of water to the auxiliary chamber 28. The water thus supplied is drawn by the operation of the piston 19 through the passages 34 and 35 respectively, the suction of the piston in the cylinder 20 lifting the valves 29 and 30. In accordance with the movement of the piston 19, the valves 40 or 41 are lifted to deliver the water trapped by the setting of the valves 30 and 29 to force said water within the passage 18 in the piston rod 17, from whence it is passed to the passage 22 of the bit 21, to be delivered through the end opening of said passage at the bottom of the hole being drilled.

When the supply of water is suiiicient to maintain the cylinder 2O practically filled, it will be observed that only at the points of rest at the end of the inner and outer strokes of said piston does the flow of water cease or hesitate. Thus, the cleaning of the hole may besaid to be continuous.

Claims- Y 1. A drill as characterized, having a re` eiprocating moto-r; 4a pump cylinder; an internally-chambered piston disposed in said cylinder, said piston having a plurality of inlet openings to the interior thereof, one of said openings being in each face of said piston; a plurality of internallyopening valves for said inlet openings; a piston rod having a passage lengthwise therethrough,

having a passage lengthwise therethrough,'

said passage being in open communication with the interior of said piston; a tool having a passage for delivering water to the cutting end of said tool, said passage being in open communication with the passage in said piston rod; and means for supplying water to said cylinder at both ends thereof, embodying means for trapping water therein.

3. A drill as characterized, having a reciprocating motor; a pump cylinder; an internally-chambered piston disposed in said cylinder, said piston having a plurality of inlet openings to the interior thereof, one of said openings being in each face of said pis ton; a plurality of internally-opening valves for said inlet openings; a piston rod having a passage lengthwise therethrough, said passage being in open communication with the interior of said piston; a tool having a passage for delivering water to the cutting end of said tool, said passage being in open communieation with the interior of the passage in said piston rod; and a water-supply for said cylinder, embodying an auxiliary chamber in open communication with inlet openings for said cylinder, adjacent the ends thereof, and a plurality of valves mounted in said chamber to prevent the back-How of water threrethrough.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

JOHN THOMAS CURNOVV.

Vitnesses AUGUST J. VVAFFEN, CARoLrNn A. LUND.

Y Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents,

- Washington, D. C. 

